Apple management has relied on various product theories over the years to explain its product portfolio. In this episode, we go over these theories, including Apple's newest product theory as recently explained by Phil Schiller. This "Grand Unified Theory of Apple Products," as I term it, gives both goals and descriptions for each of Apple's product categories. We use this theory to reach three important takeaways about Apple's future product plans. We conclude with a brief discussion of my "Peak iPad Mini" theory and why the product has seen its best days.